Comparison of pollution levels over two major European cities (Munich,Vienna) in comparision with the tropospheric background site MountSonnblick GAW Observatory; low approach at Vienna International Airport(09:52:35 ‐ 09:52:38 UTC, ~250 m)

Crete ‐ Oberpfaffenhofen; flight on the back side of a low pressure system

* Time for low approaches at various airports refer to the time when the aircraft was at the lowest altitude above the runway; in general the whole pattern takes about 10‐15 minutes.

Funding:

This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 640458 (A‐LIFE). In addition, the German Aerospace Center (DLR) provided funding for a significant amount of flight hours and aircraft allocation days for the A-LIFE aircraft field experiment. Furthermore, two EUFAR projects were clustered with A‐LIFE and provided funding for 16 flight hours. Moreover, various groups participated in the A‐LIFE field experiment on their own funding.